Solution Found!
Explain answer clearly, with complete
Chapter , Problem 18SEQ(choose chapter or problem)
Problem 18SEQ
Explain answer clearly, with complete sentences and proper essay structure if needed. An asterisk (*) designates a quantitative problem, for which you should show all your work.
*Supernovae as Standard Candles. The luminosity of a white dwarf supernova peaks around 1010LSun, and it remains above 108LSun for about 150 days. In comparison, the luminosity of a bright Cepheid variable star is about 10,000LSun. The Hubble Space Telescope is sensitive enough to make accurate measurements of apparent brightness for Cepheid variables at distances up to about 100 million light-years. Estimate the distance of a fading white dwarf supernova of luminosity 108LSun whose apparent brightness is comparable to that of a bright Cepheid variable star 100 million light-years from Earth. How does the distance of that supernova compare with the size of the observable universe?
Questions & Answers
QUESTION:
Problem 18SEQ
Explain answer clearly, with complete sentences and proper essay structure if needed. An asterisk (*) designates a quantitative problem, for which you should show all your work.
*Supernovae as Standard Candles. The luminosity of a white dwarf supernova peaks around 1010LSun, and it remains above 108LSun for about 150 days. In comparison, the luminosity of a bright Cepheid variable star is about 10,000LSun. The Hubble Space Telescope is sensitive enough to make accurate measurements of apparent brightness for Cepheid variables at distances up to about 100 million light-years. Estimate the distance of a fading white dwarf supernova of luminosity 108LSun whose apparent brightness is comparable to that of a bright Cepheid variable star 100 million light-years from Earth. How does the distance of that supernova compare with the size of the observable universe?
ANSWER:
Step 1 of 5
The mathematical relation between apparent brightness, luminosity and distance is given as,
…..(1)
Here, is the distance.
We are required to calculate the the white dwarf’s distance from the given data.